Grouping of user terminal cell access information in a system information block

ABSTRACT

Disclosed is a method for generating and transmitting system information in a mobile radio cell. In said method, system information is grouped into several information frames, information required for a mobile user device in order to verify if said mobile user device has access to the mobile radio cell being grouped into a single information frame, and the information frames are fed to the data securing layer by the network layer and are transmitted by means of the physical layer.

RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.12/441,920 filed on Mar. 19, 2009, which is a national stage entryaccording to 35 U.S.C. §371 of PCT App. No. PCT/DE2007/001590 filed onSep. 6, 2007, which claims priority from German App. No. 10 2006 044529.5 filed on Sep. 21, 2006 and from U.S. Provisional App. No.60/826,474 filed on Sep. 21, 2006, all of which are hereby incorporatedby reference in their entirety.

TECHNICAL FIELD

Various embodiments relate to a method for generating and transmittingsystem information, a network device, a method for verifying if a mobileradio user device is provided with access to a mobile radio cell, amobile radio user device and a method for determining valid systeminformation.

BACKGROUND

A base station of a cellular mobile radio communication networktransmits, in a mobile radio cell, system information which enables themobile radio user devices located in the mobile radio cell to use themobile radio communication network. Efficient methods for transmittingthis system information are desirable.

SUMMARY

A method for generating and transmitting system information in a mobileradio cell is provided, in which method system information is grouped toform several information blocks, the information required for a mobileradio user device in order to verify if said user device is providedwith access to the mobile radio cell being grouped into a single one ofthe information blocks, at least one information message is formed fromthe information blocks, the information message is supplied to a unit ofthe data link layer by a unit of the network layer and the unit of thedata link layer transmits the information message by means of at leastone unit of the physical layer.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings, like reference characters generally refer to the sameparts throughout the different views. The drawings are not necessarilyto scale, emphasis instead generally being placed upon illustrating theprinciples of the invention. In the following description, variousembodiments of the invention are described with reference to thefollowing drawings, in which:

FIG. 1 shows a communication system according to an exemplary embodimentof the invention.

FIG. 2 shows a data flowchart.

FIG. 3 shows a system information block according to an exemplaryembodiment of the invention.

FIG. 4 shows a data structure according to an exemplary embodiment ofthe invention.

FIG. 5 shows a sequence diagram according to an exemplary embodiment ofthe invention.

FIG. 6 shows a data flowchart according to an exemplary embodiment ofthe invention.

DETAILED DESCRIPTION

The following detailed description refers to the accompanying drawingsthat show, by way of illustration, specific details and embodiments inwhich the invention may be practiced.

In cellular mobile radio communication systems such as, for example,mobile radio communication systems according to the GSM (Global Systemfor Mobile Communications) standard or the UMTS (Universal MobileTelecommunications System) standard, important system information of amobile radio cell, that is to say system information which is requiredfor operating a mobile radio user device in the mobile radio cell, isconveyed by broadcasting from a base station which operates the mobileradio cell to all mobile radio user devices which are located in themobile radio cell. This system information is, for example, networkoperator-specific information such as the identity of the mobile radionetwork to which the mobile radio cell belongs, for example a PLMN(Public Land Mobile Network) identity, and the identity of the mobileradio cell (cell identity) or other information which is suitable for anunambiguous identification of mobile radio network and/or mobile radiocells.

According to an exemplary embodiment of the invention, a method forgenerating and transmitting system information in a mobile radio cell isprovided, in which method system information is grouped to form severalinformation blocks, the information required for a mobile radio userdevice in order to verify if said user device is provided with access tothe mobile radio cell being grouped into a single one of the informationblocks, at least one information message is formed from the informationblocks, the information message is supplied to a unit of the data linklayer by a unit of the network layer and the unit of the data link layertransmits the information message by means of at least one unit of thephysical layer.

According to a further exemplary embodiment of the invention, a methodfor verifying if a mobile radio user device is provided with access to amobile radio cell is provided in which method it is determined in whichinformation block of a multiplicity of information blocks transmitted inthe mobile radio cell the information required for the mobile radio userdevice in order to verify if said user device is provided with access tothe mobile radio cell is transmitted, the information block is receivedbefore other information blocks of the multiplicity of informationblocks are received, and it is verified if access to the mobile radiocell is provided for the mobile radio user device before otherinformation blocks of the multiplicity of information blocks arereceived.

According to other exemplary embodiments of the invention, a networkdevice and a mobile radio user device according to the method, describedabove, for generating and transmitting system information in a mobileradio cell and respectively the method, described above, for verifyingif a mobile radio user device is provided with access to a mobile radiocell are provided.

To illustrate, all of the system information needed by a mobile radiouser device for being able to decide whether it can successfullyregister in a mobile radio cell, that is to say all suitabilityinformation of the system information, is grouped to form oneinformation block. In this manner, it is only necessary that the mobileradio user device reads in this information block in order to be able todecide whether it should attempt to register in the mobile radio cell.

Compared with the procedure of conveying the suitability information indifferent information blocks, the reception of the suitabilityinformation and thus the deciding whether a mobile radio cell issuitable for a registration can be accelerated. This makes it possibleto reduce the time needed by a mobile radio user device for finding amobile radio cell in which it can register. Finally, the mobile radiouser device can successfully register in a mobile radio cell after ashorter time and set up a communication link to a base station.

According to another exemplary embodiment of the invention, a method fordetermining valid system information by a mobile radio user device isprovided, in which method an identification transmitted in a mobileradio cell is received which identifies a set of information requiredfor the mobile radio user device in order to verify if said user deviceis provided with access to the mobile radio cell, which set ofinformation is currently valid in the mobile radio cell, and in the casewhere the set of information is stored, it is verified by means of thestored set of information if the mobile radio user device is providedwith access to the mobile radio cell.

In this manner, it is not necessary that the mobile radio user devicereceives information but can use the stored information which leads to afurther gain in time. A stored set of information can also be markedwith a validity period which specifies until when it is valid for theidentification, in other words is identified by this identification. Inthis case, the stored set of information is used for verifying if themobile radio user device is provided with access to the mobile radiocell only when the set of information is still valid for theidentification. The identification can be transmitted, for example, in amaster information block (MIB). To illustrate, it can be signaled in amaster information block which (possibly) stored set of information iscurrently valid in the mobile radio cell.

The mobile radio cell is a mobile radio cell of a mobile radio networkwhich is configured, for example, in accordance with the UMTS standard,the GSM standard, the CDMA2000 (Code Division Multiple Access) standardor the FOMA (Freedom of Mobile Access) standard.

The information message is, for example, a PDU (Packet Data Unit) whichis supplied to the RLC layer from the RRC layer. The information messageis a system information message in one embodiment.

Exemplary embodiments of the invention can be implemented both insoftware, hardware and mixed form (that is to say partially software,partially hardware).

The further embodiments of the invention which are described inconjunction with the method for generating and transmitting systeminformation in a mobile radio cell correspondingly also apply to themethod for verifying if a mobile radio user device is provided withaccess to a mobile radio cell, to the mobile radio user device and tothe method for determining valid system information.

The information blocks are, for example, a master information block (orseveral master information blocks) or system information blocks.

The information block, into which the information required for themobile radio user device in order to verify if said user device isprovided with access to the mobile radio cell is grouped, is, forexample, a master information block. The information block, into whichthe information required for the mobile radio user device in order toverify if said user device is provided with access to the mobile radiocell is grouped, can also be a system information block.

The unit of the data link layer is, for example, a unit of the RLC(Resource Link Control) layer and the unit of the network layer is, forexample, a unit of the RRC (Radio Resource Control) layer.

In one embodiment, the information block, into which the informationrequired for the mobile radio user device in order to verify if saiduser device is provided with access to the mobile radio cell is grouped,does not contain any other information. Since the information block isthus reduced to its minimum size, it can be read in very rapidly as partof a verification if the mobile radio cell is suitable for aregistration.

The system information is transmitted, for example, by a base stationwhich operates the mobile radio cell. The unit of the data link layer isarranged, for example, in the base station. The unit of the networklayer can also be arranged in the base station.

In one embodiment, the information required for the mobile radio userdevice in order to verify if said user device is provided with access tothe mobile radio cell is associated with an identification, whichenables the mobile radio user device to verify if it has already storedthe information and which signals that the information identified by theidentification is currently valid in the mobile radio cell.

For example, the identification is inserted into the information blockinto which the information required for the mobile radio device in orderto verify if said user device is provided with access to the mobileradio cell is grouped.

The information can also be provided with validity period informationwhich specifies how long the identification for the information isvalid. This prevents the possible identifications available (for examplefrom 0 to 63, that is to say 6 bits) from being issued completely tosets of information and new sets of information can no longer beprovided with an identification.

FIG. 1 shows a communication system 100 according to an exemplaryembodiment of the invention.

The communication system 100 has the architecture of a UMTS radionetwork, which is also called UMTS Terrestrial Radio Access Network(UTRAN).

The communication system 100 has a multiplicity of radio networksubsystems (RNS) 101, 102 which are in each case coupled to the UMTScore network 105 by means of an Iu interface 103, 104.

The RNS 101, 102 in each case has a radio network controller (RNC) 107,108 and one or more base stations 109, 110, 111, 112. A UMTS basestation is also called node B.

The RNCs 107, 108 of different RNS 101, 102 are coupled to one anotherby means of an Iur interface 113.

Each base station 109, 110, 111, 112 of an RNS 101, 102 is coupled tothe RNC 107, 108 of the RNS 101, 102 by means of an Iub interface 126,127, 128, 129. Each base station 109, 110, 111, 112 of an RNS 101, 102operates one or more mobile radio cells (CE) 114 to 125 within the RNS101, 102 by radio engineering means. The RNC 107, 108 of an RNS 101, 102monitors the allocation of radio resources of the mobile radio cells 114to 125 in the RNS 101, 102.

Between a base station 109, 110, 111, 112 and a mobile radio user device(user equipment, UE) 106 in a mobile radio cell 114 to 125, informationsignals and data signals are transmitted by means of radio transmissiontechnology by means of an air interface (Uu) 130. For example, aseparate signal transmission in the uplink direction and downlinkdirection is achieved by a corresponding separate assignment offrequencies or frequency ranges in the FDD (Frequency Division Duplex)mode. Uplink is understood to be the signal transmission from the mobileradio user device 106 to a base station 109, 110, 111, 112 and downlinkis understood to be the signal transmission from a base station 109,110, 111, 112 to the mobile radio user device 106. The signals todifferent mobile radio user devices and from different mobile radio userdevices in the same mobile radio cell are separated, for example, bymeans of orthogonal codes, for example by means of the so-called CDMA(Code Division Multiple Access) method.

In the mobile radio cells 114 to 125, system information relating to theoperation of mobile radio user devices in the respective mobile radiocell are transmitted by means of the logical broadcast control channel(BCCH). The logical BCCH channel is mapped onto the transport channelBCH (Broadcast Channel) and physically transmitted by means of thephysical channel P-CCPCH (Primary Common Control Physical Channel) bymeans of the air interface. This is illustrated in FIG. 2.

FIG. 2 shows a data flowchart 200.

System information bits are transmitted to system information blocks 203of in each case 246 bits by means of the BCCH 201 and the BCH 202. Thesystem information blocks 203 are transmitted to the physical layer forsending out by means of the physical channel P-CCPCH 204 and aresupplemented with a word, for example of 26 bits length, for errorrecognition according to the CRC (Cyclic Redundancy Check). Theinformation bits and the bits appended for error recognition are jointlychannel-coded in the physical layer, modulated and spread with a CDMAcode, known throughout the system, with the spreading factor SF=256.Since a fixed transmission time interval (TTI) of 20 ms is defined(TTI=20 ms) for the BCH, the channel-coded bits are broadcast by meansof two P-CCPCH transmit frames 205 in two blocks with in each case alength of 20 ms by means of the air interface in the respective mobileradio cell.

The format of the system information blocks 203 will be explained withreference to FIG. 3 in the text which follows.

FIG. 3 shows a system information block (SIB) 300 according to anexemplary embodiment of the invention.

The system information block 300 has a system frame number (SFN) 301which consists of 12 bits. The system frame number is followed by SIBdata 302 which contains system information and consists of 234 bits. Thesystem frame number 301 specifies the timing used in the respectivemobile radio cell and is used for synchronization between base stationand mobile radio user device.

The system information block in which certain system information istransmitted is decided on the basis of the type of system information.Apart from the system information blocks, master information blocks(MIB) and scheduling blocks (SB) are also transmitted, in the presentexemplary embodiment in the same way as has been explained withreference to FIG. 2 for the system information blocks. In a masterinformation block, for example, the PLMN identify of the mobile radionetwork is transmitted, and scheduling information with respect to thetransmission of the system information blocks. In the scheduling blocks,scheduling information with respect to the system information blocks isalso signaled.

In a UMTS mobile radio network, 18 types of system information blocksare defined. The allocation of certain system information to systeminformation blocks, that is to say the allocation of which systeminformation block contains which system information, is as follows, forexample:

-   -   SIB 1 contains information about the UMTS core network and        information on configuration of system-related timers and        constants.    -   SIB 3 contains parameter values which are required for selecting        mobile radio cells and for the change of mobile radio cell by a        mobile radio user device.    -   SIB 5 contains information about the configuration of the common        physical radio resources for mobile radio user devices which are        in rest mode (ideal mode).    -   SIB 6 contains information on the configuration of the common        physical radio resources for mobile radio user devices which are        in connected mode.    -   SIB 11 contains information for carrying out measurements.

In the system information block with the number 16, parameters of theso-called “predefined configurations” are transmitted which have radiobearer parameters, transport channel parameters and physical channelparameters. When a signaling connection is set up, a mobile radio userdevice signals to the UMTS radio access network (UTRAN) an item ofinformation called “predefined configuration value tag”. This signals tothe mobile radio network that the mobile radio user device has storedthe “predefined configurations” contained in the system informationblock having the number 16. In the RRC connection setup message, theUMTS radio access network signals to the mobile radio user device whichpredefined configuration is to be used, in the form of the so-called“predefined configuration identity”. From UMTS in Version Release 5onward, an analogous procedure is also possible for the “radio bearerreconfiguration” procedure.

Furthermore, default configurations can be provided for RAB (RadioAccess Bearer) and signaling connections. These default configurationsare permanently stored in mobile radio user devices. Instead of acomplete list of parameters for setting up an RAB or a signalingconnection, the UMTS radio access network can transmit to a mobile radiouser device a so-called “default configuration identity” which specifiesa default configuration (this is possible from UMTS in Version Release 6onward). Default configurations are used for the “Handover to UTRAN”procedure in UMTS in Version R99 (Release 1999) and for the “RRCConnection Setup” and “Radio Bearer Reconfiguration” procedures in UMTSin Version Release 5.

So that a mobile radio user device can correctly use a mobile radionetwork, it ensures that it has received the current system informationin the mobile radio cell in which it is located. If the amount of systeminformation which must be read in is very large, however, the receptionand the reading in of the system information is correspondinglytime-intensive for the mobile radio user devices. This is ofdisadvantage particularly in the case of the system information whichspecifies whether a mobile radio cell is suitable for a mobile radiouser device, which will be called suitability information in the textwhich follows. Reading in the suitability information is necessary for amobile radio user device whenever it would like to change to anothermobile radio cell (cell reselection) and when the mobile radio userdevice is switched on.

According to one exemplary embodiment of the invention, all suitabilityinformation is transmitted in the master information block so that thereading in of the suitability information can be carried out efficientlyand rapidly. In one embodiment, apart from the suitability information,no other information is transmitted in the master information block. Allscheduling information is transmitted in the scheduling blocks. The sizeof the master information block can be reduced in this manner and thetime required for reading in the master information block can becorrespondingly reduced.

The suitability information is, for example:

-   -   the PLMN identity, that is to say an identification of the        mobile radio network to which the mobile radio cell belongs    -   the LAC (Local Area Code), that is to say a code of the mobile        radio network    -   Qqualmin, an item of information on the minimum quality level        required in the mobile radio cell in decibels    -   Qrxlevmin, an item of information of the minimum receiver level        in the mobile radio cell in dBm    -   an item of information on the maximum permissible transmitting        power on the uplink    -   cell barred information, for example a cell bar bit, which        indicates if the mobile radio cell is barred for mobile radio        user devices (for example mobile radio user devices without        particular privileges),    -   an intrafrequency cell reselection indicator which specifies if        the mobile radio user device can dial into the mobile radio cell        by using the same frequency as in the mobile radio cell        previously used by the mobile radio user device    -   the value of the T_(barred) parameter, which specifies how long        a mobile radio user device should remove the mobile radio cell        from its list of adjacent mobile radio cells when the mobile        radio cell is identified as barred    -   the information regarding if the mobile radio cell is reserved        for use by the operator of the mobile radio network (cell        reserved for operator use)    -   an item of information regarding if the mobile radio cell is        reserved for a future extension of the mobile radio network        (cell reservation extension).

As mentioned, the suitability information is transmitted, for example,in the master information block. The master information block iscorrespondingly arranged, for example in accordance with Table 1. Otherinformation which is transmitted in the master information block inconventional mobile radio communication networks is transmitted by meansof the scheduling blocks or by means of system information blocks in oneexemplary embodiment. For example, all scheduling information whichrelates to system information blocks and which have been transmitted inthe master block in conventional mobile radio networks are transmittedby means of the scheduling blocks in one exemplary embodiment.

TABLE 1 Name of the information Description element/the of the groupRequirement Multi Type semantics PLMN MP PLMN identity identity LAC MPBit string (16) The first/ left-most bit is the most significant bitQqualmin MP Integer Ec/N0, [dB] (−24 . . . 0) Qrxlevmin MP Integer RSCP,[dBm] (−115 . . . −25 in steps of two Maximum MP Maximum [dBm]permissible Permissible UE_TXPWR_MAX_RACH Uplink UL TX powertransmitting power Cell barred MP Information from the list (barred/notbarred) Intra- CV Information frequency barred from list cell(permissible/ reselection not permissible) indicator T_(barred) CVInteger (10, [s] barred 20, 40, 80, 160, 320, 640, 1280) Cell MPInformation reserved for from list use by the (reserved/not operatorreserved) Reserved for MP Information extension from list (reserved/notreserved)

According to a further exemplary embodiment of the invention, the entiresuitability information is transmitted within a system information blockwhich is sent, for example, in fixed time association with the masterinformation block. This means that it is specified after how much timeafter transmission of the master information block the systeminformation block is sent out by the base station.

For example, the system information block is always sent out by means ofa time frame of 10 ms in length which follows a time frame in which themaster information block has been sent out.

In another exemplary embodiment of the invention, default values areused for the system information. This means that a mobile radio userdevice stores default configurations (stored configurations), that is tosay possible values for the system information, for example possiblearrangements of system information blocks, the possible systeminformation being provided with an identification, for example with astored configuration ID, for example a number between 1 and N.

According to one exemplary embodiment of the invention, this is appliedfor the suitability information and will be explained in greater detailwith reference to FIG. 4 in the text which follows.

FIG. 4 shows a data structure 400 according to an exemplary embodimentof the invention.

The data structure 400 is stored in a mobile radio user device and isused for storing standard configurations for the suitabilityinformation. That is to say, possible valid values for the suitabilityinformation are stored in the form of the data structure 400 in themobile radio user device.

The data structure 400 has several sets of suitability information 401.Each set of suitability information 401 contains values for theparameters corresponding to the suitability information, that is to say,for example, for the abovementioned parameters of the values of whichthe suitability information consists. The sets of suitabilityinformation specify suitability information which may be valid in amobile radio cell. Each set of suitability information 401 is providedwith a suitability information identification 402 so that reference canbe made to each set of suitability information 401.

Instead of transmitting the complete suitability information to themobile radio user device, a base station, if the suitabilityinformation, which is valid in the mobile radio cell operated by thebase station corresponds to one of the sets of suitability information401, can transmit only the suitability information identification to themobile radio user device in order to signal to the mobile radio userdevice which suitability information is valid in the mobile radio cell.

For example, the date structure 400 has maximally N sets of suitabilityinformation 401. Correspondingly, the suitability informationidentification has, for example, values from 1 to N. Storing defaultvalues for the suitability information, for example in the form of thedata structure 400, is efficient and not very complex compared withinformation which, for example, characterizes the structure of a radiobearer for a radio bearer setup.

While when storing the configuration of a radio bearer (RABconfiguration) with a suitable indexing, so that during the setting upof a radio bearer the configuration of a radio bearer can be rapidlyaccessed by using an index and thus the setting up of a radio bearer canbe accelerated, a considerable complexity arises due to the high volumeof data of the parameters required for describing a radio bearer, thisis not the case when storing default configurations for suitabilityinformation and default values for suitability information can beadministered efficiently and with little complexity.

Apart from the lesser volume of data of the suitability informationcompared with parameters which are required for describing a radiobearer, the reason for this is that the suitability information changesless frequently compared with RAB configurations.

For example, the data structure 400 is built up by the suitabilityinformation sent out by the base stations being sent out together with asuitability information identification 402, and the mobile radio userdevice stores the suitability information sent out in the form of a setof suitability information 401 together with the suitability informationidentification 402 in the data structure 400. In this context, thesuitability information can be sent out in such a manner that thesuitability information is transmitted all together in a masterinformation block, the suitability information is transmitted alltogether in a system information block or the suitability informationcan also be transmitted distributed over several system informationblocks. If a base station sends out suitability information togetherwith a suitability information identification, the mobile radio userdevice can check the data structure 400 and determine by means of thesuitability information identifications 402 whether the suitabilityinformation sent out matches a set of suitability information 401. Ifthis is the case, the mobile radio user device does not need to read inthe suitability information but can use the stored set of suitabilityinformation. Otherwise, the mobile radio user device reads in thesuitability information sent out and stores it in the data structuretogether with the suitability information identification sent out.

In an exemplary embodiment of the invention, default values are storedfor each system information block. That is to say that, analogously toFIG. 4, an analogous data structure 400, in which sets of systeminformation which are sent out in this system information block arestored, is provided in the mobile radio user device for each systeminformation block.

For example, a base station sends out in the master information block,for each system information block, the system information identification(analogously to the suitability information identification 402) whichspecifies which set of system information is valid for this systeminformation block, in other words which version of the systeminformation block is currently valid. Such a master identification blockis shown in Table 2.

TABLE 2 Name of the information Description element/the of the groupRequirement Multi Type semantics List of 1 to N storedconfigurations >SIB number MP Integer (0 . . . 18) >Stored MP Integerconfiguration (0 . . . 64) ID PLMN MP PLMN identity identity LAC MP Bitstring The first/ (16) left-most bit is the most significant bitQqualmin MP Integer Ec/N0, [dB] (−24 . . . 0) Qrxlevmin MP Integer RSCP,[dBm] (−115 . . . −25 in steps of two Maximum MP Maximum [dBm]permissible permissible UE_TXPWR_MAX_RACH uplink UL TX powertransmitting power Cell barred MP Information from the list (barred/notbarred) Intra- CV Information frequency barred from list cell(permissible/ reselection not indicator permissible) T_(barred) CVInteger (10, [s] barred 20, 40, 80, 160, 320, 640, 1280) Cell MPInformation reserved for from list use by the (reserved/not operatorreserved) Reserved for MP Information extension from list (reserved/notreserved)

In this example, the master identification block, similar to the masteridentification block which is arranged according to Table 1, containsthe suitability information in accordance with lines 5 to 14 in Table 2.Corresponding to lines 2 to 4, the master identification block containsfor each system information block the system information blockidentification which specifies which set of system information iscurrently valid for this system information block. In this example, thesystem information block identifications have the values 0 to 64(compare line 4, column 4 of Table 2) and the system information blocksare numbered through from 0 to 18 (compare line 3, column 4 of Table 2).The “>” symbols indicate that the information, according to line 3 andline 4 of Table 4, that is to say the information of a systeminformation block (SIB number) is stored together with the system blockidentification for each system block in the form of the list of storedinformation (compare line 2 of Table 2).

It can be provided that for each set of system information (for exampleset of suitability information 401), a validity period is defined whichspecifies a time interval after which the set of system information fromthe mobile radio user device on which it is stored is considered as nolonger valid. This makes it possible to avoid that, after a certainoperating time of the mobile radio network, all system informationidentifications are issued and no more new system information sets canbe stored in the mobile radio user devices or can no longer be addressedby means of a system information identification.

If, for example, the range of values of the system informationidentification is 0 to 64 as in the above example, no new systeminformation sets could be addressed unambiguously by a base station bymeans of a system information identification as soon as 65 systeminformation sets have been stored and addressed by means of the systeminformation identification, that is to say a set of system informationwhich corresponds to none of the sets of system information previouslyaddressed by means of the system information identification could nolonger be identified or addressed.

By using a validity period after which the sets of system informationare no longer valid, system information identifications aredemonstratively released and are available for addressing new sets ofsystem information and can be reoccupied correspondingly.

The ISO (International Organization for Standardization) has defined areference model consisting of seven layers for describingmanufacturer-independent communication systems which is called ISO/OSImodel. The ISO/OSI model is used for describing a communication betweenvarious network devices of different manufacturers. OSI stands for OpenSystem Interconnection. Most of the freely usable network protocols arebased on this reference model, for example TCP/IP (Transport ControlProtocol/Internet Protocol). The seven levels of the ISO/OSI model aredefined in such a way that they build upon one another and that units ofone level can be used independently of the units of other levels. Theunits of levels 1 to 4 form the transport system, that is to say inlevels 1 to 4 the communication channels are defined physically andlogically, and the units of levels 5 to 7 form the application systemand are predominantly used for representing information. The sevenlevels of the ISO/OSI model are designated in their order from 1 to 7 asphysical layer, data link layer, network layer, transport layer, sessionlayer, presentation layer and application layer.

In Table 3, the designation and examples of protocols which are used aspart of the respective layer are specified for each layer.

TABLE 3 ISO/OSI layer model No. Designation Examples 7 Application layerWeb browser, mail program 6 Presentation layer HTML, XML, MIME 5 Sessionlayer http, FTP, POP3, SMTP 4 Transport layer TCP 3 Network layer IP,RRC 2 Data link layer PPP, RLC, MAC 1 Physical layer IEEE 802, PHY

The units of the application layer provide the interface between therespective user and application programs, for example for users of emailprograms or data transmission services.

The units of the presentation layer prepare data for use by the units ofthe application layer. In this context, data are decoded, for example,converted between different formats, encrypted or checked.

The units of the session layer provide services which are used fororganizing the data transmission. For example, it is guaranteed thatcommunication connections can be resumed again in spite of temporaryinterruptions. For this purpose, tokens in data packets are used, forexample.

The units of the transport layer provide the possibility of setting upand clearing down communication connections in a proper manner,synchronizing communication connections and distributing to thecommunication connections data packets for transmission by means ofseveral communication connections (multiplexing). The transport layerforms the interface between the transport system and the applicationsystem according to the ISO/OSI model. In addition, data packets aresegmented by units of the transport layer and the congestion of datapackets can be prevented.

The units of the network layer handle the switching and delivery of datapackets. For example, they carry out the assembly of routing tables andthe routing. If data packets are only to be forwarded, they are providedwith a new intermediate destination address by units of the networklayer and are not forwarded to units of higher layers. The coupling ofdifferent network topologies is also carried out in the network layer.

The units of the data link layer organize and monitor the access to thedata transmission medium. Bit streams to be transmitted are segmented inthe data link layer and combined to form packets. Furthermore, data canbe subjected to an error check, for example a checksum can be appendedto a data packet. A compression of data can also be carried out. Furthertasks of the units of the data link layer are the sequence monitoring,the time monitoring and the flow control.

The data link layer can be subdivided into two sublayers. The uppersublayer, that is to say the sublayer in the direction of the networklayer, is called the logical link control (LLC) layer and the lowersublayer, that is to say the sublayer in the direction of the physicallayer, is called the medium access control (MAC) layer. Thefunctionality of the units of the MAC layer can be developed differentlydepending on the transmission medium used (that is to say depending onthe arrangement of the physical layer). The main tasks of the MAC layerusually include:

-   -   Detecting where frames in the bit stream received by the units        of the physical layer start and stop (when receiving data).    -   Dividing the data stream into frames and possibly inserting        additional bits into the frame structure so that the start and        the end of a frame can be detected at a receiver (when        transmitting data).    -   Finding transmission errors, for example by inserting a checksum        during transmission or by corresponding control calculations        during reception, respectively.    -   Inserting and evaluating MAC addresses during transmission and        during reception, respectively.    -   Access control, that is to say when several units wish to access        the physical transmission medium, deciding which of the units is        granted the right of access.

The physical layer relates to characteristics of the transmissionmedium. For example, wavelengths and signal levels to be used aredefined. The units of the physical layer convert the bit sequences to betransmitted into transmittable formats.

According to one exemplary embodiment of the invention, a method isprovided as is shown in FIG. 5.

FIG. 5 shows a sequence diagram 500 according to one exemplaryembodiment of the invention.

The sequence diagram 500 illustrates a method for generating andtransmitting system information to a mobile radio user device in amobile radio cell.

In step 501, system information is grouped to form several systeminformation blocks, the information required for a mobile radio userdevice in order to verify if it is provided with access to the mobileradio cell, are grouped in a single one of the system informationblocks.

In step 502, at least one information message is formed from theinformation blocks.

In step 503, the information message is supplied to a unit of the datalink layer by a unit of the network layer.

In step 504, the information message is sent out by the unit of the datalink layer by means of at least one unit of the physical layer.

In FIG. 6, it is illustrated which tasks are carried out in which layersaccording to an exemplary embodiment of the invention.

FIG. 6 shows a data flowchart 600 according to one exemplary embodimentof the invention.

The data flow shown takes place between units of the network layer 601,of the data link layer 602 and the physical layer 603.

A unit of the network layer 606, in the present exemplary embodiment aunit of the RRC (radio resource control) layer, that is to say a unitwhich performs tasks in the framework of the RRC protocol, groups systeminformation 604 to form several information blocks 605.

The system information 604 is generated at least partially by a unit ofthe RRC layer.

One of the information blocks 605 contains all the information requiredfor a mobile radio user device in order to verify if it is provided withaccess in the mobile radio cell in which the system information 604 issent out, that is to say all suitability information.

From the information blocks, information messages 609 are formed in theRRC layer 601, which messages are supplied to a unit of the data linklayer 607, in the present example a unit of the RLC (radio link control)layer, that is to say a unit which performs tasks within the frameworkof the RLC protocol.

The unit of the data link layer 607 supplies the information messages609, which were supplemented with error correction bits for a possibleerror correction, or segmented for sending out, for example, by the unitof the data link layer 607, to a unit of the physical layer 608. Theunit of the physical layer 608 sends out the information messages 609.For example, the information messages 609 are broadcast in the mobileradio cell.

The information blocks 605 can be both system information blocks (SIBS)and a master information block (MIB).

The sending out of the information messages 609 by means of the unit ofthe physical layer 608, for example a physical channel, for example abroadcast channel, can also involve a unit of the MAC layer (not shown)which, for example, regulates the access to the physical channel.

While the invention has been particularly shown and described withreference to specific embodiments, it should be understood by thoseskilled in the art that various changes in form and detail may be madetherein without departing from the spirit and scope of the invention asdefined by the appended claims. The scope of the invention is thusindicated by the appended claims and all changes which come within themeaning and range of equivalency of the claims are therefore intended tobe embraced.

LIST OF REFERENCE DESIGNATIONS

100 Communication system

102, 102 RNS

103, 104 Iu interface

105 Core network

106 User device

107, 108 RNC

109-112 Base stations

113 Iur interface

114-125 Radio cells

126-129 Iub interface

130 Air interface

200 Data flowchart

201 BCCH

202 BCH

203 System information blocks

204 P-CCPCH

205 P-CCPCH transmit frame

300 System information block

301 System frame number

302 SIB data

400 Data structure

401 Sets of suitability information

402 Suitability information identification

500 Sequence diagram

501-504 Sequence steps

600 Data flowchart

601 Network layer

602 Data link layer

603 Physical layer

604 System information

605 Information blocks

606 Unit of the network layer

607 Unit of the data link layer

608 Unit of the physical layer

609 Information messages

1. A base station comprising: a unit of a radio resource control (RRC)layer at least partially implemented in hardware, the unit of the RRClayer to: identify cell suitability information that is usable by amobile radio user device to verify whether the mobile radio user deviceis provided with access to a mobile radio cell, wherein the cellsuitability information includes a Qrxlevmin information item, a cellbarred information item, an intrafrequency cell reselection indicator, aQqualmin information item, and a cell reserved for operator useinformation item; and group the cell suitability information into asingle information block; and a unit of a physical layer at leastpartially implemented in hardware, the unit of the physical layercoupled with the unit of the RRC layer, the unit of the physical layerto transmit the single information block.
 2. The base station of claim1, wherein the single information block is one of a plurality ofinformation blocks that includes one or more master information blocksand one or more system information blocks.
 3. The base station of claim2, wherein the single information block is a system information block.4. The base station of claim 1, wherein the cell suitability informationis associated with an identification that is to enable the mobile radiouser device to verify whether it has already stored the cell suitabilityinformation and signal that the suitability information identified bythe identification is currently valid in the mobile radio cell.
 5. Thebase station of claim 4, wherein the identification is inserted into thesingle information block.
 6. The base station of claim 4, wherein thesuitability information is provided with validity period informationwhich specifies how long the identification for the information isvalid.
 7. The base station of claim 1, wherein cell suitabilityinformation further includes: an item of information on the maximumpermissible transmitting power on an uplink, a Local Area Code (LAC), aPublic Land Mobile Network (PLMN) identity, a Tbarred parameter value,and a cell reservation extension information item.
 8. The base stationof claim 1, wherein the Qrxlevmin information item relates to a minimumreceiver level in the mobile radio cell, the cell barred informationitem relates to whether the mobile radio cell is barred, theintrafrequency cell reselection indicator relates to whether a samefrequency can be used for cell reselection, the Qqualmin informationitem relates to a minimum quality level in the mobile radio cell, andthe cell reserved for operator use information item relates to whetherthe mobile radio cell is reserved.
 9. The base station of claim 1,wherein the single information block is transmitted at a predefined timesubsequent to a transmission of a master information block.
 10. Anapparatus comprising: one or more processors; and one or morenon-transitory computer-readable media comprising instructions that,when executed by at least one of the one or more processors, cause theapparatus to: identify cell suitability information that is usable by amobile radio user device to verify whether the mobile radio user deviceis provided with access to a mobile radio cell, wherein the cellsuitability information includes a Qrxlevmin information item, a cellbarred information item, an intrafrequency cell reselection indicator, aQqualmin information item, and a cell reserved for operator useinformation item; and group the cell suitability information into asingle information block.
 11. The apparatus of claim 10, wherein thesingle information block is one of a plurality of information blocksthat includes one or more master information blocks and one or moresystem information blocks.
 12. The apparatus of claim 11, wherein thesingle information block is a system information block.
 13. Theapparatus of claim 10, wherein the cell suitability information isassociated with an identification that is to enable the mobile radiouser device to verify whether it has already stored the cell suitabilityinformation and signal that the suitability information identified bythe identification is currently valid in the mobile radio cell.
 14. Theapparatus of claim 13, wherein the identification is inserted into thesingle information block.
 15. The apparatus of claim 13, wherein thesuitability information is provided with validity period informationwhich specifies how long the identification for the information isvalid.
 16. The apparatus of claim 10, wherein cell suitabilityinformation further includes: an item of information on the maximumpermissible transmitting power on an uplink, a Local Area Code (LAC), aPublic Land Mobile Network (PLMN) identity, a Tbarred parameter value,and a cell reservation extension information item.
 17. The apparatus ofclaim 10, wherein the Qrxlevmin information item relates to a minimumreceiver level in the mobile radio cell, the cell barred informationitem relates to whether the mobile radio cell is barred, theintrafrequency cell reselection indicator relates to whether a samefrequency can be used for cell reselection, the Qqualmin informationitem relates to a minimum quality level in the mobile radio cell, andthe cell reserved for operator use information item relates to whetherthe mobile radio cell is reserved.
 18. An apparatus comprising: one ormore processors; and one or more non-transitory computer-readable mediacomprising instructions that, when executed by at least one of the oneor more processors, cause the apparatus to: identify, in a singleinformation block, cell suitability information that is usable by amobile radio user device to verify whether the apparatus is providedwith access to a mobile radio cell, wherein the cell suitabilityinformation includes a Qrxlevmin information item, a cell barredinformation item, an intrafrequency cell reselection indicator, aQqualmin information item, and a cell reserved for operator useinformation item; and transmit the single information block.
 19. Theapparatus of claim 18, wherein the single information block is one of aplurality of information blocks that includes one or more masterinformation blocks and one or more system information blocks.
 20. Theapparatus of claim 19, wherein the single information block is a systeminformation block.
 21. The apparatus of claim 18, wherein the cellsuitability information is associated with an identification that is toenable the apparatus to verify whether it has already stored the cellsuitability information and signal that the suitability informationidentified by the identification is currently valid in the mobile radiocell.
 22. The apparatus of claim 21, wherein the identification isinserted into the single information block.
 23. The apparatus of claim21, wherein the suitability information is provided with validity periodinformation which specifies how long the identification for theinformation is valid.
 24. The apparatus of claim 18, wherein cellsuitability information further includes: an item of information on themaximum permissible transmitting power on an uplink, a Local Area Code(LAC), a Public Land Mobile Network (PLMN) identity, a Tbarred parametervalue, and a cell reservation extension information item.
 25. Theapparatus of claim 18, wherein the Qrxlevmin information item relates toa minimum receiver level in the mobile radio cell, the cell barredinformation item relates to whether the mobile radio cell is barred, theintrafrequency cell reselection indicator relates to whether a samefrequency can be used for cell reselection, the Qqualmin informationitem relates to a minimum quality level in the mobile radio cell, andthe cell reserved for operator use information item relates to whetherthe mobile radio cell is reserved.
 26. The apparatus of claim 18,wherein the instructions are further to cause the apparatus to transmitthe single information block at a predefined time period subsequent totransmission of a master information block.